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Please read
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Before contest
Codeforces Round (Div. 1)
3 weeks
Before contest
Codeforces Round (Div. 2)
3 weeks
→ Filter Problems
Difficulty:
—
games
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x370
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x6104
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x662
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
2100
x2336
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3803
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x22189
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x24032
2002B
Removals Game
constructive algorithms
,
games
1000
x17653
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x689
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x66
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x417
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x4010
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x21652
1987D
World is Mine
dp
,
games
1800
x6892
1972B
Coin Games
games
900
x21088
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1456
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2534
1970C1
Game on Tree (Easy)
games
1400
x3239
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14597
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17600
1965E
Connected Cubes
constructive algorithms
,
games
3100
x251
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13392
1956B
Nene and the Card Game
games
,
greedy
800
x21035
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21346
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6948
1952E
Sweep Line
combinatorics
,
games
,
math
x247
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x267
1943A
MEX Game 1
games
,
greedy
1300
x17609
1942E
Farm Game
combinatorics
,
games
2300
x1653
1939D
Big Persimmon
*special problem
,
dp
,
games
x87
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1372
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x15598
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14662
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9717
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x20645
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x179
1919A
Wallet Exchange
games
,
math
800
x33203
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x17709
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x12272
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x12113
1906G
Grid Game 2
games
,
number theory
2900
x192
1899A
Game with Integers
games
,
math
,
number theory
800
x45681
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1556
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16997
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x7348
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x11206
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x765
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2627
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x13299
1858A
Buttons
games
,
greedy
,
math
800
x38323
1848A
Vika and Her Friends
games
,
math
900
x16807
1844A
Subtraction Game
constructive algorithms
,
games
800
x24518
1842A
Tenzing and Tsondu
games
,
math
800
x19757
1841A
Game with Board
constructive algorithms
,
games
800
x24672
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13263
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1242
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x775
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x751
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x337
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x676
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x798
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x479
1772E
Permutation Game
games
1700
x6758
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3842
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13916
1747C
Swap Game
games
1200
x21194
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x11007
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x9073
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x11149
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5744
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7228
1719A
Chip Game
games
,
math
800
x25504
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x505
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x1037
1695B
Circle Game
games
,
greedy
1000
x18448
1695A
Subrectangle Guess
games
800
x16331
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23847
1681A
Game with Cards
games
,
greedy
800
x20965
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18431
1672A
Log Chopping
games
,
implementation
,
math
800
x16067
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3922
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x191
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1046
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2061
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3143
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16625
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x869
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1477
1610I
Mashtali vs AtCoder
games
,
trees
3100
x283
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2934
1600E
Array Game
games
,
greedy
,
two pointers
1900
x2097
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x182
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1276
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x12378
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x955
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x7914
1527B1
Palindrome Game (easy version)
constructive algorithms
,
games
1200
x26056
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x783
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x7034
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x918
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